linux-kernel - Re: [BUG REPORT] Kernel panic on 3.9.0-rc7-4-gbb33db7

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Message-ID: <20130419061755.GC9691@mtj.dyndns.org>
Date:	Thu, 18 Apr 2013 23:17:55 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Wanlong Gao <gaowanlong@...fujitsu.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Steven Rostedt <rostedt@...dmis.org>,
	namhyung@...il.com, agk@...hat.com, dm-devel@...hat.com,
	neilb@...e.de, LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Mason <chris.mason@...ionio.com>,
	linux-btrfs@...r.kernel.org
Subject: Re: [BUG REPORT] Kernel panic on 3.9.0-rc7-4-gbb33db7

On Thu, Apr 18, 2013 at 10:57:54PM -0700, Tejun Heo wrote:
> No wonder this thing crashes.  Chris, can't the original bio carry
> bbio in bi_private and let end_bio_extent_readpage() free the bbio
> instead of abusing bi_bdev like this?

BTW, I think it's a bit too late to fix this properly from btrfs side
unless we're gonna do -rc8, so let's revert the TP patch for now and
sort this out in the next devel cycle.  AFAICS, while disturbingly
(ha|yu)cky, the bi_bdev trick should be okay without the new TP.

Thanks.

-- 
tejun
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